Fitment: For Predator 212cc Hemi，only fit the hemi predator engine. Package Includes：1 x aluminum flywheel,1 x Main Jet Kit,1 x 26lb Springs Kit，1 x spark plug. High quality aluminum flywheel, reduced resistance, higher speed, increased power.These springs will provide extra performance at over 10000RPM.Length and Rate Tolerance will vary from spring to spring. Product performance upgrade, can withstand greater pressure, in the case of maintaining high speed, can also be a good control of the valve, and reduce wear, effectively reduce the fault situation. The flywheel is made of a stronger aluminum material, the thread design plays a better fixing role, provides high-speed rotation, smooth operation, and the spring and Main Jet provide more power.